Method for acquiring magnetic resonance data from a large examination region
In a method for magnetic resonance data acquisition from an examination region, that is larger than a maximum acquisition region of the magnetic resonance apparatus, a planning data set is generated and that is used to establish the examination region and the examination region is automatically separated into a number of acquisition regions by a computer. Each of the acquisition regions is limited in terms of its dimensions by the maximum acquisition region. A measurement protocol is created that includes parameters that are applicable for all acquisition regions and parameters applicable specifically for only one acquisition region. The acquisition regions are automatically positioned in series within the maximum acquisition volume with the measurement protocol in order to generate a measurement data set for each acquisition region. The measurement data sets are subsequently combined.
1. A method for acquiring magnetic resonance data from an examination region using a magnetic resonance apparatus, the examination region being larger than an inherently maximum data acquisition region from which the magnetic resonance apparatus is structurally and operationally capable of acquiring magnetic resonance data, comprising the steps of:
generating a planning data set and establishing said examination region using said planning data set;
in a computer of said magnetic resonance apparatus, automatically separating the examination region into a plurality of acquisition regions having respective dimensions with said inherently maximum acquisition region of said magnetic resonance apparatus being an upper limit for said dimensions;
creating a measurement protocol comprising a first group of measurement protocol parameters that are applicable for all of said acquisition regions, and at least one second group of measurement protocols that are applicable specifically for one of said acquisition regions;
automatically positioning said acquisition regions in series within said inherently maximum acquisition region using said measurement protocol, and acquiring a magnetic resonance data set from each of said acquisition regions;
combining said magnetic resonance data sets into an overall magnetic resonance data set of said examination region using said computer and said first and second groups of measurement parameters of said measurement protocol said overall data set comprising data representing said examination region that is larger than said inherently maximum data acquisition region; and
making said overall data set available for processing into an image of said examination region.
2. A method as claimed in claim 1 wherein the step of establishing said examination region comprises setting dimensions of said examination region in successive units, each of a predetermined dimension.
3. A method as claimed in claim 1 wherein the step of automatically separating said examination region into a plurality of acquisition regions comprises automatically dividing said acquisition region into a plurality of equally sized acquisition regions.
4. A method as claimed in claim 1 wherein the step of establishing said examination region comprises setting dimensions of said examination region continuously.
5. A method as claimed in claim 1 wherein the step of automatically separating said examination region into a plurality of acquisition regions comprises initially dividing said examination region into a plurality of equally sized acquisition regions, and automatically individually adjusting respective dimensions of the acquisition regions between a minimum volume and a maximum volume.
6. A method as claimed in claim 1 wherein the step of automatically separating said examination region into a plurality of acquisition regions includes partially overlapping at least two of said acquisition regions with each other to encompass a slice orientation of a slice of said examination region extending across said at least two of said acquisition regions.
7. A method as claimed in claim 1 comprising, in said computer, automatically aligning respective slice orientations of slices in said examination region dependent on a geometry of said examination region.
8. A method as claimed in claim 1 wherein the step of automatically positioning said acquisition regions comprises automatically positioning one of said acquisition regions in a maximum acquisition volume, using said measurement parameters, to obtain a substantially distortion-free magnetic resonance data set from that acquisition region.